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Major cities must unite against climate change: Paris Mayor Anne Hidalgo

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Major cities must unite against climate change: Paris mayor (via AFP)

Paris Mayor Anne Hidalgo urged the world’s major cities to unite in the fight against climate change. Stressing that half the world’s population is now urbanized, she noted that cities are already responsible for 80 percent of greenhouse gas emissions…

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Quantum dots that light up TVs could be used for brain research

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While many people love colorful photos of landscapes, flowers or rainbows, some biomedical researchers treasure vivid images on a much smaller scale – as tiny as one-thousandth the width of a human hair.

To study the micro world and help advance medical knowledge and treatments, these scientists use fluorescent nano-sized particles.

Quantum dots are one type of nanoparticle, more commonly known for their use in TV screens. They’re super tiny crystals that can transport electrons. When UV light hits these semiconducting particles, they can emit light of various colors.

That fluorescence allows scientists to use them to study hidden or otherwise cryptic parts of cells, organs and other structures.

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Scientists shed light on how brains turn pain up or down

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Pain perception is essential for survival, but how much something hurts can sometimes be amplified or suppressed: for example, soldiers who sustain an injury in battle often recall not feeling anything at the time.

A new study published in Cell Reports on Tuesday honed in on the brain circuitry responsible for upgrading or downgrading these pain signals, likening the mechanism to how a home thermostat controls room temperature.

Yarimar Carrasquillo, the paper's senior author and a scientist for the National Center for Complementary and Integrative Health (NCCIH), told AFP the region responsible was the central amygdala, which according to her work appeared to play a dual role.

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NASA unveils flexible, one-size-fits-all space suits

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Bye bye to bunny hops: when US astronauts next touch down on the Moon, expect them to walk almost as they do on Earth, thanks to a new generation of spacesuits offering key advantages over those of the Apollo-era.

Prototypes of the Orion Crew Survival Suit that will be worn on the journey and the Exploration Extravehicular Mobility Unit (xEMU) for the lunar surface were unveiled at NASA's Washington headquarters Tuesday ahead of the agency's planned return to the Moon by 2024.

Standing in front of a giant US flag, spacesuit engineer Kristine Davis wore a pressurized red, blue and white xEMU suit, showing off a vastly improved range of motion thanks to bearings systems on the waist, arms, and legs.

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